Speed control device



Dec. 1, 1931 E. E. HARPER SPEED CONTROL DEVICE 2 Sheets-Sheet 1 FiledDec. 5, 1927 r 6 f a ATTORNEY Dec. 1, 1931. I E. E. HARPER 3 SPEEDCONTROL DEVICE Filed Dec. 5, 1927 2 Sheets-Sheet 2 47 IIIIIIIIIIIIIIIIIIl/{IIII/{IIII/IIIIIII/A H IIIIIIIIHIM N 24 \W 4 mulllllllllllllllmgyINVENTOR Li/mer 5 Harper ATTORNEY 7 delivery embodying -my inventionshown Patented Dec. 1, 1931 ELMER E. HARPER, OF SAS CITY, MISSOURI srnnnCONTROL DEVICE Application filed December 5, 1927. SeriaI No. 237,781.

My inventionv relates to material feeding machines and more particularlyto means for controlling the delivery of a constituent such as lime orother powdered material to a container such as a tank for producing asolution or mixture; the present invention constituting an improvementon the machine forwhich Letters Patent of the United States No.1,616,970 were issued to me on February 8, 1927, and having for itsprincipal objects to provide automatic control of material deliverymeans, to deliver portions of material at intervals which may beincreased or reduced in regular progression to provide a wide range ofdelivery intervals, and to provide automatic-control of the measuringfactor responsive to the amounts of water to be treated.

In accomplishing these and other objects of the inventionI have providedimproved details of structure, the preferred forms of which areillustrated in the accompanying drawings, wherein: I

' Fig. 1 is a verticalsectional view of a machine havingmat'erial-delivering elements, and provided with means for controllingthe partly in section; v p H I V Fig. 2 is an enlarged central'sectionof the reduction gear and proportional feed device, and upper portionsof associated elements.

Fig. 3 is a cross section on the line 33,

Fig. 2, including a 'plan, view of peripheral tloned on the upper end ofthe tubular shaft portions of the elementsi 1 Fig. 4 is an elevation ofrelated disks and a pawl for rotating intermittently a ratcheted diskformeasured actuation of deliveryelements.

Referring in detail to the drawings:

1 designates a solution tank having a water inlet 2 and an outlet 3,-and4 is a bin erected on the tank having a-hopper 5 through which drymaterial may be introduced into the bin, a bottom plate 6 of the binhaving apertures 7 through which material is delivered from the bin totables 8 suported by the tank, a disk 9 having peripheral U-shapednotches 10 be ing rotatable as presently described over the bottom platefor intermittent coincidence of notches with the openings for controlof,

pin 31 fixed radially in the rod 12, whereby delivery of the material tothe tables. The

material deposited on the tables is removed therefrom for delivery to aposition for use,

and shown as being delivered into thesolution tank to provide asolution, by an arm 11 movably keyed to the lower end of a rod'12extending upwardly through the bin, the shaft being supported andactuated in a man- .ner presently described. 7

Covering the top of the bin is a plate 13 having a laterally extendingshelf portion 14, and fixed to the plate by bolts 15 is a housingelement 16 having an annular upstanding gear-enclosing flange 17 and agear-supporting body portion 18 provided with a shaft journal 19 onwhich are supported, adjacentthe journal opening, annular thrustbearings 20 for rotatable support of a gear wheel 21.

A tubular shaft 22 in which the rod 12 is rotatably and slidably mountedextends rotatably through said bin bottom 6 and housing 18, and is keyedto said gear wheel 21 by a screw 23 for continuous rotation by said gearwheel under actuation of the same by a worm 24 rotated from a pulley 25by a motor 26 positioned on said shelf 14.

The rod 12 extends beyond both ends of the tubular shaft 22, the arm 11being attached to the lower end of the rod in spaced position from thelower end of the tubular shaft and the upper end of the shaft beingthreaded.

A disk 27 having an axial collar 28 is posiwhich is rotatable therein,and the rod 12 extends through the disk and collar and is sup ported onthe collar by a nut 29 engaged with the upperend of the rod, the collarbeing provided with a vertical slot 30 to receive a the disk whenintermittently rotated as presently described may cause the rod torotate, and whereby the rod 12 may be elevated or lowered to space thearm 11 from the tables 8.

Means for supporting and intermittently rotating the disk 27 include aplate 32 sup ported by the upstanding flange 17 of the housing, having ahub 33 in which the tubular shaft is rotatable, and an upstandingsemicircular peripheral flange or pawl track 34,

the plate being fixed to the housing in permanent position and may beintegral therewith; and a pawl disk 35 keyed to the tubular shaft as at36 having a hub '37 whereby it is a plurality of ratchet teeth 42adjacent its periphery on its under surface, and a pawl disk isp-rovided with pawls 43 pivotally mounted radially on its peripheryhaving short fore armsor teeth 44 and relatively long rear arms orweighted ends 45, the pawl disk being so positioned that the pawlsnormally pivot so that the teeth engage the ratchet teeth of the disk. I

' The pulley disk38 is adapted for rotation to a desired position bymeans which are prefrotating tubular shaft;

erably illustrated as a chain 46 extending in a peripheral roove 4? ofthe pulley disk.

The pawl disk is rotated by the constantly The elements are provided sothat the pawls ride on the semicircular track of the plate 34 over apart of their rotation and during the remainder of their rotation, theweighted ends of the pawls are permitted to drop close to the normalsurface of the plate and while the pawls are in this position, the toothends are permitted toengage the ratchet disk to rotate the same. Thesemi-circular flange or track 41 of the pulley di k is also adapted tosupport the weighted end of a pawl, and when the pulley diskis in such aposition that the track or flange 41 fully registers with the track 4,

the pawl rides on thetwo tracks coincidently and is restrained fromengaging the ratchet only over such pats. hen the pulley disk is rotatedso that its track 41 does not fully register with the track 34, the'pawlis restrained from engagement with the ratcheted disk not only duringits travel over the track 34 but additionally during travel over theportion of the flange 41 that extends beyond the semi-circular positionof the track 34, whereby a shorter arc of rotation is pr'ovided invlvhich the pawl is engaged with the ratchet dis i. i

A plurality of pawls is preferably provided and at diametricallyopposite positions on the pawl disk so that when the pulley disk track41 registers with the track 34, substantially continuous engagement ofthe pawls with the ratcheted disk is provided.

I provide means for indicating the osition of the semi-circular pawltrack 0 the pulley disk comprising a scale 49 on the track 41 and anarrow 50 on the similar track 34 of the plate whereby the pulley diskmay be rotated to indicate a particular position of -spikes.54projecting adjacent the walls of the bin for dislodging materialtherefrom.

' A shoeelement' may be provided as shown, attached to a stationarypart. such as the plate 32, having a 'shoe56f adapted to overlie theratchet disk and engage it frictionally to serve as a brakeforrestraining the ratchet disk against casual movement by the tubularshaft. i i

V A weight may be attached to one end of the chain and a float may beattachedto the other end whereby the changes in elevation of a watersurface may control the rotation of the disk to regulate the functionthereof, as

now to be described; the pulley being also manually operable.

In operating the device, the'pulley disk is set, for example manually,so .thatthe track of the disk does not exactly coincide with the trackof the plate disk, an end of the pulley disk track extending beyond theplate disk track. A pawl will be supported out of engagement with theratchet over 180 degrees of its rotation by the plate disk track, andwill be further supported by the extending portion of the track of thepulley disk over an additional number of degrees. The pawl willtherefore be permitted to pivot to engage and cause rotation of theratchet disk and the rod, over a relatively short are, whereby thematerial-delivering arm of the rod is moved over a relatively short areof its circular path, to perform its function of removing material fromthe table. The number of material-removing operations performed duringasingle complete rotation of the ratchet disk 27 audits driven-rod 12 isgoverned by ,the'number of projecting arms 11, tables 8andicorresponding vorifices 7.

The number of rotations of the ratchet disk will also be in ratio to thenumber of rotationsof the tubular shaft, the ratio being gpverned by thearc in which the'pawl teeth are engaged with the ratchet disk.

A very large number of changes in the relation between the constantrotations of the tubular shaft and the intermittent rotations of the armare possible, whereby the intervals between deliveries of material bythe arm may be varied for delivering small or large quantities of thematerial to the waterto be treated, or forsupplying'the materials toflowing water at desired spaced intervals.

What I claim and desire to secure by Letters Patent is: j

1. In a machine of the character described, in combination with acontinuously moving tubular member, a rod slidably mounted in thetubular member and a ratchet disk keyed to said rod, a pawl, meansrotatable by said tubular member supporting the pawl for norma-lengagement with said ratchet disk for rotating the same, and meansadjustably movable over the tubular member for pivoting the pawl out ofratchet engaging position.

2. In a device of the character described including a frame and adriving shaft, a driven ratchet movably mounted on said shaft, a pawlrevoluble by the driving shaft normally engaged with the ratchet, a cammember fixed to the frame for pivoting the pawl out of ratchet engagingposition, and a movable member supported by the frame havingpawl-pivoting portions and adapted for movement to pivot the pawl inpositions adjacent said cam member.

3. In a machine of the character described, a support, a tubular shaftrotatable in the support, a rod rotatably mounted in said tubular shaft,a disk having a marginal ratchet rotatably mounted on the tubular shaftand keyed to the rod, a plate having an upstanding flange fixed ,to thesupport, a second disk having a limited flange and rotatable adjacentsaid plate flange, and a pawl adapted for rotation by said tubular shaftand normally engaged with the ratchet teeth of said first named disk andpivotal by said flanges out of engagement with said disk.

4. In a machine of the character described comprising a frame, a tubularshaft, supported by the frame, and a rod movable in the tubular shaft, aratchet having an annular series of teeth keyed to the rod for rotatingthe same, a pawl movable in a circular path by the shaft in engagementwith the ratchet, and means for pivoting the pawl out ofratchet-engaging position including a cam element positioned in the pathof the pawl comprising a fixed member and a movable member adapted foradjustably lengthening the effective extent of the cam element.

support, a rod rotatably mounted in said tubular shaft and supportedthereby, a disk havin ratchet teeth rotatably supported on the tuularshaft, a plate having an upstand- 7. In a device of the characterdescribed, a

driven element, a ratchet connected with the driven element, means foroperating the ratchet including a pawl-carrying member and a pawlpivoted on said member normally engaged with said ratchet, pluraladjustable means for disengaging the pawl from the ratchet for releasingthe driven element over measured portions of the track of theratchet-operating means, one of said plural adjustable pawl-disengagingmeans having a surface provided wit a scale, and the other of said meansbeing adapted to provide an indicator to cooperate with said scale forigdicating the disengaging adjustment there 0 8. In a device of thecharacter described including a rotative shaft, a ratchet, and a pawlmounted on said shaft and engageable with the ratchet to move the same,means including a disk rotative on said shaft having an upstandingflange engageable by said pawl for disengaging the pawl from theratchet.

In testimony whereof I afiix my si ature.

ELMER E. HAR ER.

5. In a machine of the character'described, I

a support, a tubular shaft rotatable in the support, a rod rotatablymounted in said tubular shaft, a disk having ratchet teeth rotatablymounted on the tubular shaft and keyed to said rod, a plate having alimited upstanding flange fixed to the support, a second disk having alimited flange and adapted for adjustable positioning adjacent saidplate flange, and a pawl adapted for rotation by said tubular shaft andtiltable by said adjacent flanges for intermittently engaging theratchet teeth of said first named disk to impart motion to said disk. 7V

6. In a machine of the character described, a support, a tubular shaftrotatable in the

